Even Ivo Karlovic willingly admits that whatever success he has on a tennis court is due mainly to his big serve.
Well, that one stroke is in fine form at the moment, and so is Karlovic, closing in on a second consecutive title at age 37.
Karlovic saved all five break points he faced Saturday and ran his service-game record to 43 for 43 this week, beating fifth-seeded American Steve Johnson 6-4, 6-4 to reach the Citi Open final.
"This is my game. This is my strength," said the 6-foot-11 Karlovic, a Croatian seeded 13th at the hard-court tournament.
He broke Johnson in the third game of each set, right after saving break points on his own serve.